When Shopping Around For A Roof Cleaning Contractor, You Should Be Concerned If They Will Not Tell You What Chemical They Are Using, Or Its Ratio, If Indeed They Do Even Dilute It And If They Do A Thorough low Pressure Rinse that is suggested by The Asphalt Roofing Manufacturers Association. All Tile Roofs Should Not Have Any Type Of High Pressure Used On Them Either, as this can result in damage to the mortared areas.
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